Gas-burner for boiler-furnaces



(No Model.)

6'. T. S .N. GAS BURNER FOR B R TURN AGES.

N0. 500,7%4. Patented July 4, 1893.

coco

NrrEn STATES PATENT OFFICE.

CHARLES T. SLOAN, OF BUFFALO, NEW YORK.

GAS-BURN ER FOR BOILER-FURNACES.

SPECIFICATION forming part of Letters Patent No. 500,724, dated July 4,1893. Application filed December 2'7, 1892. Serial Ha 56,390. (Nomodel.)

To all whom it may concern:

Be it known that I, CHARLES T. SLOAN, a citizen of the United States,residing at Buffalo, in the county of Erie and State of New York, haveinvented new and useful Improvements in Gas-Burners for Boiler-Furnaces,of which the following is a specification.

This invention relates to gas burners designed more particularly for usein connection with steam boiler furnaces for burning either natural orartificial gas, and which are provided with means for mixing air withthe gas,

to promote combustion. Such burners are usually arranged in groups organgs on opposite sides of the combustion chamber, and hegetofore it hasbeen the practice to provide each burner with a separate or individualair mixer, which renders the same expensive.

The object of my invention is to provide the burners with a simple airmixing device and to construct the same in such a manner that only asingle part or manifold is required for a group or plurality of burners,thereby reducing their cost.

In the accompanying drawingsz-Figure 1 is a longitudinal section of asteam boiler furnace equipped with my improved burners, the plane ofsection being in line 11, Fig. 2. Fig. 2 is a vertical cross section ofthe same in line 22, Fig. 1. Fig. 3 is a fragmentary horizontal sectionof the furnace in line 3-3, Fig. 1. Fig. 4 is a fragmentary verticallongitudinal section of one of the burners and connecting parts, on anenlarged scale.

Like letters of reference refer to like parts in the several figures.

A is the steam boiler which is. inclosed in masonry in any well knownmanner.

B is the combustion chamber, C the usual grate bars, D the feed door andE the ash pit.

F represents the gas burners which are preferably arranged in two seriesor groups on opposite sides of the combustion chamber and open into thelatter above the usual level of the coal or similar solid fuel, whensuch fuel is used instead of gas.

G G represent gas supply manifolds, preferably arranged lengthwise inthe ash pit, adjacent to its side walls, and each having a supply pipeG. Each of the gas burners con sists of an upright mixing tube f, havingan inwardly extending exit branch f opening at the adjacent inner wallof the combustion chamber, and an upright gas nozzle or pipe fconnecting at its lower end with the gas manifold G and projecting ashort distance into the open lower end of the mixing tube f. Thisnozzle-pipe is open at its upper end to admit the gas into the mixingtube and is separated from the inner wall of the tube by an annular airspace or passage f The upper portions of the mixing tubes and their exitbranches f are preferably embedded in the masonry of the furnace, asshown.

. H H are horizontal supporting plates or air supply manifolds arrangedin the ash pit, underneath the two groups of burners, respectively, andupon which the mixing tubes of the burners rest, said plates beingformed on their upper sides with raised annular rims or sockets h, inwhich the lower ends of the tubes are seated and confined againstdisplacement. These plates are preferably supported from the gasmanifolds G by upright rods or pipes t' secured at their lowerscrew-threaded ends in threaded openings formed in the upper side ofsaid manifolds, as shown in Fig. at. Each of these supporting rods orpipes passes with its upper portion through an opening in the supportingplate and is provided above and below the plate with nuts t" "L betweenwhich the plate is clamped. These plates are raised above the gasmanifolds G as shown, to admit air underneath the same, and each plateis provided with vertical air apertures 0r passages j which registerwith the lower ends of the mixing tubes respectively, and which extendthrough the plate and are larger than the gas nozzles f to permit air torise between the latter and the walls of the apertures' Kis ahorizontally movable damper or valve plate arranged underneath each airmanifold H and adapted to be raised against the under side thereof, asshown by dotted lines in Fig. 4:,- for closing its air passages j whenit is de- "sired to burn coal or other solid fuel, instead of gas. Thedamper is supported in this raised position by placing removable blocksunder it, or by any other suitable means. In its open or depressedposition, the damper preferably rests loosely upon the gas manifold Gand is confined in place and guided in its movements by the supportingrods 1' which pass through openings in the damper. The ends of thedamper are recessed, as shown at Z, in Figs. 3

. and 4, to clear the lower nuts of the said supadmitting gas to themanifolds G, the gas passes into the mixing tubes of the several burnersthrough the nozzles f and at the same time a certain volume of air isdrawn into thelower ends ofthe mixing tubes through the air apertures inthe air manifolds or supporting plates H, thereby insuring a completecombustion. The supply of air may be increased or diminished by varyingthe distance between the dampers or valve plates and the under side ofsaid air manifolds.

Myimproved air mixing device is extremely simple in construction, as itinvolves but a single perforated plate which is cast in one piece atsmall cost. It also avoids the necessity of employing a separate mixerfor each burner and saves the time and labor incident to applying theusual individual mixers to the burners, and it furthermore furnishes afirm support for the burners, especially when they are not incased inthe masonry of the furnace.

I claim as my invention-- The combination with a gas supply manifold, ofa supporting plate or air supply manifold arranged above said gasmanifold and having air apertures, a number of burners having mixingtubes resting upon said air manifold and registering respectively withthe air apertures of the latter, gas nozzles extendin g upwardly fromsaid gas manifolds through said apertures and into said mixing tubes,and a damper or valve plate supported in its open position upon said gasmanifold and adapted to close against the under side of said airmanifold, substantially as set forth.

Witness my hand this 22d day of December, 1892.

CHARLES T. SLOAN.

Witnesses:

CARL F. GEYER, FRED. O. GEYER.

